How Does Energy Efficiency Relate to Renewable Energy?

There is a lot happening in renewable energy right now, which is great and what we need. But what about conservation? … Are there any studies showing how much we could save and at what cost if we insulated all the uninsulated houses and double-paned all the windows and sealed all the air leaks? In the same vein what about solar thermal? It’s much more cost effective than solar electricity but not pushed nearly so hard, or so it seems.

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